TFA lamented a tablet's shortcomings when used as a "computer": direct file manipulation, rapid voluminous text input, instant viewing of bulky data, vast local storage, raw CPU power, etc. My counter-challenge/observation as intended was that using a non-tablet (a "phone" in context being little different from a tiny tablet) would not perform particularly well at doing what a "mobile device" excels at: right-here right-now anytime anywhere calling, texting, emailing, photography, GPS, location-critical web-surfing, etc.
You proved my point by not even coming close to suggesting doing "real work" with a phone (no matter its IQ), other than to transition to a complementary (and decidedly stationary) computer when mobility-related capabilities are not needed.
The take-away from all this is there isn't a convergence point.